Backlight assembly and display device having the same

ABSTRACT

A backlight assembly includes a light guide plate (LGP) having a stepped portion formed at a corner of the LGP, an optical sheet disposed over the LGP and a receiving container receiving the LGP and the optical sheet. The receiving container includes a bottom plate, first through fourth sidewalls and a first LGP fixing portion. The second sidewall is adjacent to the first sidewall. The third sidewall faces the first sidewall. The fourth sidewall faces the second sidewall. The first through fourth sidewalls are extended upwardly from edge portions of the bottom plate. The first LGP fixing portion is formed at the first sidewall such that the LGP fixing portion corresponds to the stepped portion of the LGP. Therefore, a display device is easily assembled. Furthermore, a defilement that may occur during an assembling process may be reduced to enhance productivity.

This application claims priority to Korean Patent Application No.2004-62141, filed on Aug. 6, 2004 and all the benefits accruingtherefrom under 35 U.S.C. §119, and the contents of which in itsentirety are herein incorporated by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a backlight assembly and a displaydevice having the backlight assembly. More particularly, the presentinvention relates to an easily assembled backlight assembly, and adisplay device having the backlight assembly.

2. Description of the Related Art

A backlight assembly generates light for displaying images. Thebacklight assembly is used for a liquid crystal display device thatdisplays images by using liquid crystal.

A conventional backlight assembly includes a lamp assembly thatgenerates light, a light guide plate that adjusts a path of the light, alight-reflecting plate disposed under the light guide plate to reflectlight escaping the light guide plate, and optical sheets that enhanceoptical properties of the light generated from the lamp assembly.Additionally, the conventional backlight assembly includes a bottomchassis, a receiving container and a panel-guiding member. The bottomchassis and the receiving container receive the lamp assembly, the lightguide plate, the light-reflecting plate and the optical sheets. Thebottom chassis can be made of metal and the receiving container can bemade of, for example, plastic. The panel-guiding member prevents adisplay panel from drifting from the receiving container.

SUMMARY OF THE INVENTION

The present invention provides an easily assembled backlight assembly.

The present invention also provides a display device having theabove-mentioned backlight assembly.

In exemplary embodiments of a backlight assembly, the backlight assemblyincludes a light guide plate, an optical sheet and a receivingcontainer. The light guide plate has a stepped portion formed at acorner of the light guide plate. The optical sheet is disposed over thelight guide plate. The receiving container receives the light guideplate and the optical sheet. The receiving container includes a bottomplate, a first sidewall, a second sidewall, a third sidewall, a fourthsidewall and a first light guide plate fixing portion. The secondsidewall is adjacent to the first sidewall. The third sidewall faces thefirst sidewall. The fourth sidewall faces the second sidewall. The firstthrough fourth sidewalls are extended upwardly from edge portions of thebottom plate. The first light guide plate fixing portion is formed atthe first sidewall such that the first light guide plate fixing portioncorresponds to the stepped portion of the light guide plate.

In exemplary embodiments of a display device, the display deviceincludes a backlight assembly, a panel-guiding member and a displaypanel. The backlight assembly includes a light guide plate, an opticalsheet and a receiving container. The light guide plate has a steppedportion formed at a corner of the light guide plate. The optical sheetis disposed over the light guide plate. The receiving container receivesthe light guide plate and the optical sheet. The receiving containerincludes a bottom plate, a first sidewall, a second sidewall, a thirdsidewall, a fourth sidewall and a first light guide plate fixingportion. The second sidewall is adjacent to the first sidewall. Thethird sidewall faces the first sidewall. The fourth sidewall faces thesecond sidewall. The first through fourth sidewalls are extendedupwardly from edge portions of the bottom plate. The first light guideplate fixing portion is formed at the first sidewall such that the firstlight guide plate fixing portion corresponds to the stepped portion ofthe light guide plate. The panel-guiding member is combined with thereceiving container. The display panel is disposed on the panel-guidingmember. The display panel converts light generated from the backlightassembly into an image.

In exemplary embodiments of a method for assembling a display device ina top down assembling process, the method includes providing a receivingcontainer with a light guide plate fixing portion, providing a lightguide plate with a stepped portion at a corner of the light guide plate,placing the light guide plate into the receiving container, and aligningthe light guide plate fixing portion with the stepped portion.

The light-reflecting plate, the light guide plate, the lamp assembly,the panel-guiding member and the display panel are assembled in sequencethrough a top-down assembling method. Therefore, a display device iseasily assembled. Furthermore, a defilement that may happen during anassembling process may be reduced to enhance productivity.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other features and advantages of the present inventionwill become more apparent by describing in detailed exemplaryembodiments thereof with reference to the accompanying drawings, inwhich:

FIG. 1 is an exploded perspective view illustrating an exemplaryembodiment of a backlight;

FIG. 2 is an exploded perspective view illustrating another exemplaryembodiment of a backlight assembly;

FIG. 3 is a plan view illustrating the backlight assembly in FIG. 2 inan assembled condition;

FIG. 4 is an exploded perspective view illustrating another exemplaryembodiment of a backlight assembly;

FIG. 5 is an exploded perspective view illustrating an exemplaryembodiment of a lamp assembly in FIG. 4;

FIG. 6 is an exploded perspective view illustrating another exemplaryembodiment of a backlight assembly;

FIG. 7 is an exploded perspective view illustrating another exemplaryembodiment of a backlight assembly;

FIG. 8 is a cross-sectional view taken along line I-I′ in FIG. 7;

FIG. 9 is a cross-sectional view taken along line II-II′ in FIG. 7; and

FIG. 10 is a perspective view illustrating an exemplary embodiment of adisplay device.

DETAILED DESCRIPTION OF THE INVENTION

It should be understood that the exemplary embodiments of the presentinvention described below may be modified in many different ways withoutdeparting from the inventive principles disclosed herein, and the scopeof the present invention is therefore not limited to these particularembodiments. Rather, these embodiments are provided so that thisdisclosure will be thorough and complete, and will fully convey theconcept of the invention to those skilled in the art by way of exampleand not of limitation. In the drawings, the thickness of layers, films,and regions are exaggerated for clarity. Like numerals refer to likeelements throughout. It will be understood that when an element such asa layer, film, region, or substrate is referred to as being “on” anotherelement, it can be directly on the other element or intervening elementsmay also be present.

Backlight Assembly

The exemplary embodiments of a backlight assembly described hereininclude a light guide plate having a stepped portion, an optical sheetdisposed on the light guide plate and a receiving container having abottom plate supporting the light guide plate and the optical sheet,sidewalls extended from edge portions of the bottom plate, and an LGPfixing portion formed at the sidewalls corresponding to the steppedportion to fix the light guide plate.

Hereinafter, the exemplary embodiments of the present invention will bedescribed in detail with reference to the accompanied drawings.

FIG. 1 is an exploded perspective view illustrating an exemplaryembodiment of a backlight assembly according to the present invention.

Referring to FIG. 1, a backlight assembly 400 includes a receivingcontainer 100, a light guide plate 200, and an optical sheet 250. Thebacklight assembly 400 further includes a lamp assembly (as shown inFIGS. 4-7 and 10).

The light guide plate 200 includes a light-reflecting face 201, alight-exiting face 202 opposed to the light-reflecting face 201 andparallel with the light-reflecting face 201, a first side face 210, asecond side face 220, a third side face 230, and a fourth side face 240.As illustrated, the first and third side faces 210, 230 may be parallelto each other, the second and fourth side faces 220, 240 may be parallelto each other, and the first side face 210 and the third side face 230may be perpendicular to the second and fourth side faces 220, 240.

The light guide plate 200 includes a stepped portion 216. The steppedportion 216 is disposed at a corner, a plurality of corners, or allcorners of the light guide plate 200. In other words, the steppedportion 216 is formed at a joint region of the first and second sidefaces 210 and 220. The stepped portion 216 is also formed at a jointregion of the second and third side faces 220 and 230. The steppedportion 216 is also formed at a joint region of the third and fourthside faces 230 and 240. The stepped portion 216 is also formed at ajoint region of the fourth and first side faces 240 and 210. Thus, eachstepped portion 216 forms an indentation at each corner of the lightguide plate 200. The illustrated stepped portion 216 includes a firstwall extending from one of the side faces, e.g. first side face 210, anda second wall extending from an adjacent side face, e.g. fourth sideface 240. The first wall abuts the second wall to form the steppedportion 216. The stepped portion 216, as illustrated, includesperpendicular first and second walls, although the walls may be disposedat alternate angles with respect to each other. Also, although the firstand second walls of the stepped portion 216 may be flat, planar walls,they may alternately be curved, jagged, or otherwise non-planar.

The optical sheet 250 is disposed over the light-exiting face 202. Theoptical sheet 250 includes at least one optical film. The optical sheet250 includes, for example, a light-diffusing film, a brightnessenhancing film (BEF), etc. The optical sheet 250 enhances opticalproperties of light that exits the light guide plate 200 through thelight-exiting face 202. The optical sheet 250 includes a fixingprotrusion 252. The fixing protrusion 252 protrudes from a side face ofthe optical sheet 250. The fixing protrusion 252 includes a fixing hole252 a. The fixing protrusion 252 may include a plurality of fixing holes252 a, or, alternatively, a plurality of fixing protrusions 252 may beformed on one or more side faces of the optical sheet 250, each havingone or more fixing holes 252 a.

The receiving container 100 includes a bottom plate 160, a firstsidewall 110, a second sidewall 120, a third sidewall 130, and a fourthsidewall 140, where each sidewall extends upwardly from the bottom plate160. The first sidewall 110 of the receiving container 100 faces thefirst side face 210 of the light guide plate 200. The second sidewall120 of the receiving container 100 faces the second side face 220 of thelight guide plate 200. The third sidewall 130 of the receiving container100 faces the third side face 230 of the light guide plate 200. Thefourth sidewall 140 of the receiving container 100 faces the fourth sideface 240 of the light guide plate 200. The sidewalls may besubstantially solid walls extending along a majority of a peripheraledge of the bottom plate 160, such as first and third sidewalls 110 and130, or may be one or more flanges evenly or otherwise spaced, such assecond and fourth sidewalls 120, 140.

The first sidewall 110 of the receiving container 100 includes a lightguide plate (LGP) fixing portion 111 a. For example, a first end portionof the first sidewall 110, which is adjacent to the fourth sidewall 140,is cut and bent toward the stepped portion 216 to form the LGP-fixingportion 111 a, so that the light guide plate 200 is fastened to thereceiving container 100 when assembled. In one embodiment of theLGP-fixing portion 111 a, the LGP-fixing portion 111 a is bentsubstantially perpendicularly to the first sidewall 110, such that theLGP-fixing portion 111 a is substantially parallel to, but not coplanarwith, the second and fourth sidewalls 120, 140.

A second LGP-fixing portion 111 b, similar to the LGP-fixing portion 111a, may also be formed at a second end portion of the first sidewall 110,which is adjacent to the second sidewall 120. Additionally, anLGP-fixing portion, similar to the LGP-fixing portions 111 a and 111 b,may be formed at a first end portion of the third sidewall 130, which isadjacent to the fourth sidewall 140, and at a second end portion of thethird sidewall 130, which is adjacent to the second sidewall 120.

At least one of the sidewalls 110, 120, 130 and 140 includes a fixingboss 110 c corresponding to the fixing hole 252 a of the optical sheet250 to fasten the optical sheet 250 to the receiving container 100. Thefixing boss 110 c is inserted into the fixing hole 252 a as the opticalsheet is placed on top of the receiving container 100, so that theoptical sheet 250 is fixed in place relative to the receiving container100. The fixing boss 110 c may be a small protuberance, projection, orthe like extending from an upper peripheral edge of a sidewall, and thepositioning and number of fixing bosses 110 c correspond to thepositioning and number of fixing holes 252 a provided on the opticalsheet 250.

FIG. 2 is an exploded perspective view illustrating another exemplaryembodiment of a backlight assembly according to the present invention,and FIG. 3 is a plan view illustrating the backlight assembly in FIG. 2,in an assembled condition. The backlight assembly of FIG. 2 issubstantially the same as the above-described backlight assembly of FIG.1, except for an LGP-fixing portion as will be further described below.Thus, the same reference numerals will be used to refer to the same orlike parts as those described in FIG. 1 and any repetitive explanationconcerning the above elements will be omitted.

Referring to FIGS. 2 and 3, a first sidewall 110 of a receivingcontainer 100 includes a first LGP-fixing portion 115 for fixing a lightguide plate 200 within the receiving container 100. The first LGP-fixingportion 115 is disposed substantially parallel with the first sidewall110. However, the first LGP-fixing portion 115 and the first sidewall110 are not in a same line, that is, they are not co-planar. The firstLGP-fixing portion 115 is disposed such that the first LGP-fixingportion 115 corresponds to the stepped portion 216 of the light guideplate 200, such as facing a second wall of the stepped portion 216 thatextends from the fourth side face 240. The first LGP-fixing portion 115is spaced apart from the third sidewall 130 by a first distance W1, andthe first sidewall 110 is spaced apart from the third sidewall 130 by asecond distance W2. The second distance W2 is greater than the firstdistance W1. Thus, the first LGP-fixing portion 115 is spaced from thefirst sidewall 110 by a distance defined generally by the differencebetween the second distance W2 and the first distance W1.

The first LGP-fixing portion 115 is spaced apart from the second wall ofthe stepped portion 216 of the light guide plate 200, the second wallextending from the fourth side face 240, by a first gap G1, and thefirst sidewall 110 of the receiving container 100 is spaced apart fromthe first side face 210 of the light guide plate 200 by a second gap G2.The second gap G2 is, for example, smaller than the first gap G1.

As in the illustrated embodiment, when the second gap G2 is smaller thanthe first gap G1, the second wall of the stepped portion 216 of thelight guide plate 200 does not make contact with the first LGP-fixingportion 115 of the receiving container 100, wherein, such as during aninadvertent shift due to an impact of the light guide plate 200 withinthe receiving container 100, the first side face 210 of the light guideplate 200 makes contact with the first sidewall 110 of the receivingcontainer 100 instead of the first LGP-fixing portion 115 making contactwith the first sidewall 110. Therefore, the light guide plate 200 andthe receiving container 100 are protected because the first sidewall 110has a larger surface area than the first LGP-fixing portion 115, andtherefore absorbs an impact.

The first and second gaps G1 and G2 can be determined by a surface areaof the first LGP-fixing portion 115 and the first sidewall 110. Forexample, when an area of the first LGP-fixing portion 115 is smallerthan an area of the first side face 110, the first gap G1 is larger thanthe second gap G2. On the contrary, if an area of the first LGP-fixingportion 115 is larger than an area of the first side face 110, then thefirst gap G1 would be smaller than the second gap G2. To vary the sizeof the gap G1, the first LGP fixing portion 115 may be positioned closertowards or away from the second wall of the stepped portion 216.Changing the size of the gap G1 can make the gap G1 smaller or largerthan the gap G2. Alternatively, the gap G2 may be altered viamanufacturing the first sidewall 110 at a position closer towards orfurther away from the first side face 210. Changing the size of the gapG2 can make the gap G2 smaller or larger than the gap G1.

The second wall of the stepped portion 216 of the light guide plate 200,which faces or makes contact with the first LGP-fixing portion 115, has,for example, a rounded-shape. For example, the rounded-shape has aradius of curvature, which is no less than about 0.3 mm. Fixing boss 110c may be formed on the first LGP-fixing portion 115.

The receiving container 100 may further include a second LGP-fixingportion 111 b, similar to the second LGP-fixing portion 111 b of FIG. 1.The second LGP-fixing portion 111 b is disposed at the first sidewall110. The second LGP-fixing portion 111 b is disposed opposite to thefirst LGP-fixing portion 115. The second LGP-fixing portion 111 bcorresponds to and faces a first wall of the stepped portion 216, andmay further make contact with the stepped portion 216.

The first LGP-fixing portion 115 may also be formed at the thirdsidewall 130 facing the first sidewall 110. The first LGP-fixing portion115 formed at the third sidewall 130 has, for example, substantiallyidentical shape to the first LGP-fixing portion 115 formed at the firstsidewall 110. In addition, or alternatively, the third sidewall 130 mayinclude the second LGP-fixing portion 111 b on one or both ends of thethird sidewall 130.

FIG. 4 is an exploded perspective view illustrating another exemplaryembodiment of a backlight assembly according to the present invention,and FIG. 5 is an exploded perspective view illustrating a lamp assemblyin FIG. 4. The backlight assembly of FIG. 5 is substantially the same asthe above-described backlight assembly in FIG. 2 except for theinclusion of a lamp assembly. Thus, the same reference numerals will beused to refer to the same or like parts as those described in FIG. 2,and any repetitive explanation concerning the above elements will beomitted.

Referring to FIGS. 4 and 5, the first and third sidewalls 110 and 130face each other, and the second and fourth sidewalls 120 and 140 faceeach other. The first and third sidewalls 110 and 130 are substantiallyparallel with each other, and the second and fourth sidewalls 120 and140 are substantially parallel with each other. Additionally, the secondand fourth sidewalls 120 and 140 are substantially perpendicular to thefirst and third sidewalls 110 and 130.

Two lamp assemblies 300 are disposed adjacent to the second and fourthsidewalls 120 and 140, respectively. A longitudinal axis of each lampassembly 300 is generally parallel to the sidewalls 120, 140. Each ofthe lamp assemblies 300 includes a lamp 310, a lamp cover 320 and a lampholder 330, or two lamp holders 330, one on each end of the lamp 310.

The lamp 310 includes discharge gas (not shown) injected therein, one ormore lamp bodies 312 having a fluorescent layer (not shown) formed oninner surface of the lamp body 312, and a pair of electrodes 314disposed at the lamp body 312 to apply discharge voltage to thedischarge gas. The pair of electrodes 314 is electrically connected tothe wires 316, respectively. The lamp body 312 includes a longitudinalaxis substantially parallel to the second and fourth sidewalls 120, 140.

The lamp cover 320 reflects light generated from the lamp 310 toward thesecond or fourth side face 220 or 240 of the light guide plate 200. Thelamp cover 320 includes a first cover plate 321, a second cover plate322, and a third cover plate 323 perpendicular to the first cover plate321 and the second cover plate 322. While the lamp cover 320 isillustrated as having planar and substantially perpendicular coverplates, it should be understood that alternate embodiments of lamp cover320 would be within the scope of these embodiments, including, but notlimited to, a lamp cover 320 with curved walls.

The first cover plate 321 is disposed such that the first cover plate321 faces the bottom plate 160 of the receiving container 100. Thesecond cover plate 322 is disposed such that the second cover plate 322faces the first cover plate 321. The first and second cover plates 321,322 are substantially in parallel with each other. In the illustratedembodiment, an area of the first cover plate 321 is larger than an areaof the second cover plate 322. The third cover plate 323 makes contactwith and abuts against the second or fourth sidewall 120 or 140, and thethird cover plate 323 connects the first and second cover plates 321 and322.

The first cover plate 321 of the lamp cover 320 includes a firstconnection hole 321 a and a through hole 321 b for fastening the lampcover 320 to the bottom plate 160 of the receiving container 100. Forexample, the first cover plate 321 includes at least two through holes321 b, and the first connection hole 321 a is disposed between thethrough holes 321 b.

The bottom plate 160 of the receiving container 100 includes a boss 162corresponding to the through hole 321 b of the lamp cover 320.Additionally, the bottom plate 160 includes a second connection hole 164corresponding to the first connection hole 321 a of the lamp cover 320.A screw 165 passes through the first and second connection holes 321 aand 164 to combine the lamp cover 320 and the receiving container 100.

The lamp 310 is disposed within a space defined by the first, second,and third cover plates 321, 322, and 323. The lamp 310 is combined withthe lamp cover 320 via a lamp holder 330, positioned on each end of thelamp 310. The lamp holder 330 has, for example, a rectangular parallelpiped shape and the lamp holder 330 is at least partially inserted intoends of the lamp cover 320 such that the lamp holder 330 makes contactwith the first, second, and third cover plates 321, 322, and 323, sothat the lamp holder 330 is fastened to the lamp cover 320.

The lamp holder 330 includes at least one insertion hole 332. An endportion of the lamp 310 is inserted into the insertion hole 332, so thatthe lamp 310 is combined with the lamp holder 330.

The lamp holder 330 makes contact with the end portion of the lamp 310that generates a large amount of heat. Therefore, the lamp holder 330 isdisposed such that the lamp holder 330 dissipates the heat well. Aportion of the lamp holder 330 is not covered by the lamp cover 320 andprotrudes longitudinally outwardly from the bottom plate 160.

FIG. 6 is an exploded perspective view illustrating a portion of anotherexemplary embodiment of a backlight assembly. The backlight assembly ofFIG. 6 is substantially the same as the above-described backlightassembly in FIG. 4 except further includes a fixing member. Thus, thesame reference numerals will be used to refer to the same or like partsas those described in FIG. 4 and any repetitive explanation concerningthe above elements will be omitted.

Referring to FIG. 6, the LGP-fixing portion 115 is spaced apart from thefirst sidewall 110, so that light may be leaked through a space definedbetween the LGP-fixing portion 115 and the first sidewall 110.

In order to prevent leakage of light, a fixing member 180 is disposed ata backside of the LGP-fixing portion 115, where the backside of theLGP-fixing portion 115 is the side of the LGP-fixing portion 115 notfacing the second wall of the stepped portion 216. The fixing member 180blocks the space between the LGP-fixing portion 115 and the firstsidewall 110 to prevent the leakage of light.

The fixing member 180 includes a first fixing portion 182 and a secondfixing portion 184. The second fixing portion 184 is protruded from anend portion of the first fixing portion 182, such as perpendicularly, sothat the fixing member 180 has an L-shaped cross-section.

A first face of the first fixing portion 182 makes contact with thebackside of the LGP-fixing portion 115. A thickness of the first fixingportion 182 from the first face of the first fixing portion 182 to asecond face of the first fixing portion 182 is at least as large as adistance defined between planes of the first LGP fixing portion 115 andthe first sidewall 110, such as, but not limited to, the distancedefined generally by the difference between the second distance W2 andthe first distance W1, or larger. The second fixing portion 184 isdisposed at the bottom plate 160 of the receiving container 100.

The fixing member 180 may further also fix the wire 316 that iselectrically connected to the electrode 314 of the lamp 310 in FIG. 5.The first fixing portion 182 includes grooves 182 a, extending at leastthrough the second face of the first fixing portion 182, for receivingthe wire 316.

According to the present embodiment, the backlight assembly may includea plurality of the fixing members corresponding to a plurality of theLGP-fixing portions 115.

FIG. 7 is an exploded perspective view illustrating another exemplaryembodiment of a backlight assembly. FIG. 8 is a cross-sectional viewtaken along a line I-I′ in FIG. 7, and FIG. 9 is a cross-sectional viewtaken along a line II-II′ in FIG. 7. The backlight assembly of FIG. 7 issubstantially the same as the above-described backlight assembly inFIGS. 1 and 4 except further includes a panel-guiding member 500 andelements for engaging the panel-guiding member 500. Thus, the samereference numerals will be used to refer to the same or like parts asthose described in FIGS. 1 and 4 and any repetitive explanationconcerning the above elements will be omitted.

Referring to FIGS. 7, 8 and 9, a backlight assembly further comprises apanel-guiding member 500. The panel-guiding member 500 fastens the lightguide plate 200 to the receiving container 100. The panel-guiding member500 includes an upper plate 510 facing the bottom plate 160 of thereceiving container 100. That is, the upper plate 510 is parallel withthe bottom plate 160. The upper plate 510 has a frame shape, where alarge opening is centrally provided within the upper plate 510 forallowing the passage of light. A side plate 520 faces the first throughfourth sidewalls 110, 120, 130 and 140 of the receiving container 100.The side plate 520 is combined with the sidewalls 110, 120, 130 and 140of the receiving container 100.

The panel-guiding member 500 includes a plurality of guide protrusions530. The guide protrusions 530 are formed on an upper surface of theupper plate 510 of the panel-guiding member 500, where the upper surfaceof the upper plate 510 is a surface that faces away from the receivingcontainer 100 and faces towards a display panel, as will be furtherdescribed below. The guide protrusions 530 guide the display panel. Forexample, four guide protrusions 530 are disposed at four corners of thepanel-guiding member 500, respectively, although alternate numbers andarrangements of guide protrusions 530 would be within the scope of theseembodiments.

The panel-guiding member 500 also includes at least one combination hole525. In the illustrated embodiment, a plurality of the combination holes525 are formed at the side plate 520 of the panel-guiding member 500.Additionally, the receiving container 100 includes at least onecombination hook 170, and corresponds in number and arrangement to thecombination holes 525. The combination hook 170 is illustratively formedat the third and fourth sidewalls 130 and 140 of the receiving container100, but may be formed along any, including all, of the sidewalls 110,120, 130, and 140. The combination hook 170 includes a protruding memberextending outwardly from one or more of the sidewalls 110, 120, 130, and140. When the panel guiding member 500 is pressed over the receivingcontainer 100, the combination hooks 170 are initially compressedinwardly, but as the combination holes 525 move over the combinationhooks 170, the combination hooks 170 are allowed to return to a biasedoutwardly protruding position, thus seated within or protrudingoutwardly of the combination holes 525. As can be seen in FIG. 9, thepanel-guiding member 500 cannot be accidentally displaced from thereceiving container 100 because the combination hooks 170 preventaccidental movement of the side plate 520 in a direction away from thebottom plate 160. The combination hooks 170 may be forcibly pressedinwardly by a tool or the like if removal of the panel-guiding member500 from the receiving container 100 is desired. In an alternateembodiment, the combination hooks 170 may be provided on the side plate520 and the combination holes 525 may be provided on the sidewalls ofthe receiving container 100.

The panel-guiding member 500 further includes a pressing protrusion 515.The pressing protrusion 515 makes contact with the stepped portion 216of the light guide plate 200 to prevent the drift of the light guideplate 200. The pressing protrusion 515 is protruded toward the bottomplate 160 of the receiving container 100 from the upper plate 510 asshown in FIG. 8.

The pressing protrusion 515 protects the light guide plate 200 and thereceiving container 100, and prevents the drift of the light guide plate200.

Display Device

FIG. 10 is a perspective view illustrating an exemplary embodiment of adisplay device according to the present invention. The display device ofFIG. 10 includes the above-described backlight assembly in FIG. 7. Thedisplay device further includes a display panel. Thus, the samereference numerals will be used to refer to the same or like parts asthose described in FIG. 7, and any repetitive explanation concerning theabove elements will be omitted. The display device includes a displaypanel 700 and a backlight assembly 600. The display panel 700 isdisposed on the panel-guiding member 500. The display panel 700 convertslight generated from the backlight assembly 600 into an image. Thedisplay panel 700 includes a thin film transistor (TFT) substrate 710, acolor filter substrate 720, and a liquid crystal layer 730.

The TFT substrate 710 and the color filter substrate 720 control theliquid crystal layer 730 disposed between the TFT substrate 710 and thecolor filter substrate 720. The TFT substrate 710 includes a pluralityof pixel electrodes (not shown) arranged in a matrix shape. The pixelelectrodes include an optically transparent and electrically conductivematerial such as indium tin oxide (ITO), indium zinc oxide (IZO), etc.

The color filter substrate 720 faces the TFT substrate 710. The colorfilter substrate 720 includes a plurality of color filters (not shown)and a common electrode (not shown).

An arrangement of liquid crystal molecules within the liquid crystallayer 730 disposed between the TFT substrate 710 and the color filtersubstrate 720 is altered when electric fields are applied to the liquidcrystal layer 730. When the arrangement of the liquid crystal moleculesis altered, an optical transmissivity of the liquid crystal layer 730 ischanged to display an image.

The backlight assembly 600 further includes one or more optical sheets250. The optical sheets 250 are disposed between the display panel 700and the light guide plate 200. The optical sheets 250 enhance opticalproperties such as luminance of the light and luminance uniformity ofthe light exiting the light guide plate 200. The backlight assembly 600further includes a light-reflecting plate 750 that is disposed betweenthe bottom plate 160 of the receiving container 100 and the light guideplate 200. The light-reflecting plate 750 reflects light toward thelight guide plate 200. The optical sheet 250 and the light-reflectingplate 750 may include stepped portions corresponding to stepped portions216 of the light guide plate 200 such that the light-reflecting plate750, the light guide plate 200, and the optical sheet 250 may all beguided into and seated within the receiving container 100.

According to the present invention, the light-reflecting plate, thelight guide plate, the lamp assembly, the optical sheet, thepanel-guiding member and the display panel are assembled in sequencethrough a top-down assembling method. That is, the light-reflectingplate 750 may first be placed within the receiving container 100. Thestepped portions of the light-reflecting plate 750 can help ensure thatthe light-reflecting plate 750 is accurately placed within the receivingcontainer 100. Then, the light guide plate 200 may be placed within thereceiving container 100 and on top of the reflecting plate 750. Thestepped portions 216 of the light guide plate 200 are aligned with theLGP fixing portions 111 a, 111 b, and/or 115 for ensuring properplacement and protection of the light guide plate 200. The lampassemblies 300 may be arranged within the receiving container 100adjacent to the light guide plate 200. If the LGP fixing portion 115 isused, then a fixing member 180 may be combined with the LGP fixingportion 115 to block light leakage. The optical sheet or sheets 250 maythen be placed above the light guide plate 200, while aligning allfixing holes 252 a with fixing bosses 110 c and stepped portions withany LGP fixing portions. The panel guiding member 500 may then be placedover the optical sheet 250 and positioned to surround the receivingcontainer 100 such that the combination hooks 170 from the receivingcontainer 100 are snapped within the combination holes 525 on the sideplate 520 of the panel guiding member 500 and the pressing protrusions515 are placed against any stepped portions 216. The display panel 700is then placed upon the guide protrusions 530 of the panel-guidingmember 500. Therefore, the display device is easily assembled.Furthermore, a defilement that may happen during an assembling processmay be reduced to enhance productivity.

Having described the exemplary embodiments of the present invention andits advantages, it is noted that various changes, substitutions andalterations can be made herein without departing from the spirit andscope of the invention as defined by appended claims. Moreover, the useof the terms first, second, etc. do not denote any order or importance,but rather the terms first, second, etc. are used to distinguish oneelement from another. Furthermore, the use of the terms a, an, etc. donot denote a limitation of quantity, but rather denote the presence ofat least one of the referenced item.

What is claimed is:
 1. A backlight assembly comprising: a light guideplate having a recessed stepped portion disposed at a side of the lightguide plate; an optical sheet disposed over the light guide plate; and areceiving container which receives the light guide plate and the opticalsheet, the receiving container including a bottom plate, a firstsidewall, and a second sidewall facing the first sidewall, wherein thefirst and second sidewalls extend upwardly from edge portions of thebottom plate, the receiving container further including a first lightguide plate fixing portion having a horizontal thickness substantiallysame as one of a horizontal thickness of the first and second sidewallssuch that the horizontal thickness is a thickness in a recesseddirection of the recessed stepped portion, wherein a portion of thefirst light guide plate fixing portion is aligned with the recessedstepped portion of the light guide plate, wherein the first light guideplate fixing portion extends upwardly from edge portions of the bottomplate wherein the first light guide plate fixing portion is spaced apartfrom the first and second sidewalls.
 2. The backlight assembly of claim1, wherein the optical sheet comprises a fixing hole aligned with anoptical sheet fixing portion, wherein the fixing hole is provided withina fixing protrusion protruding from the optical sheet.
 3. The backlightassembly of claim 1, further comprising a second light guide platefixing portion disposed at an end portion of the first sidewall, whereinthe second light guide plate fixing portion is aligned with anadditional recessed stepped portion of the light guide plate.
 4. Thebacklight assembly of claim 1, further comprising a light sourceassembly providing a light to the light guide plate.
 5. The backlightassembly of claim 4, wherein the light source assembly comprises: alight source which generates light; a light source cover which coversthe light source; and a light source holder which holds the lightsource, wherein the light source holder is combined with the lightsource cover for fastening the light source to the light source cover.6. The backlight assembly of claim 5, wherein the light source covercomprises a first connection hole and a through hole and the bottomplate of the receiving container comprises a second connection holecorresponding to the first connection hole and a boss corresponding tothe through hole, wherein the boss is inserted into the through hole toguide the light source cover onto the bottom plate, and wherein thelight source cover and the receiving container are combined with eachother through a screw passing through the first and second connectionholes.
 7. The backlight assembly of claim 5, wherein a portion of thelight source holder is protruded outwardly from the bottom plate fordissipating heat generated from the light source.
 8. The backlightassembly of claim 5, further comprising a fixing member disposedadjacent a side of the light guide plate fixing portion facing away fromthe first light guide plate fixing portion.
 9. The backlight assembly ofclaim 8, wherein the fixing member comprises a first fixing portionhaving a groove for receiving a wire which is electrically connected tothe light source, and a second fixing portion protruded from the firstfixing portion and combined with the bottom plate of the receivingcontainer, wherein the fixing member has an L-shaped cross-sectionalshape.
 10. The backlight assembly of claim 1, further comprising a panelguiding member disposed over the optical sheet, wherein the panelguiding member is combined with the first and second sidewalls of thereceiving container.
 11. The backlight assembly of claim 10, wherein thepanel guiding member comprises an upper plate facing the bottom plate ofthe receiving container, and a side plate combined with one of the firstand second sidewalls of the receiving container.
 12. The backlightassembly of claim 11, wherein the upper plate of the panel guidingmember comprises a pressing protrusion protruding downwardly forcontacting the recessed stepped portion of the light guide plate forpreventing drifting of the light guide plate.
 13. The backlight assemblyof claim 1, wherein the light guide plate fixing portion, the bottomplate and the first and second sidewalls are integrally formed.
 14. Thebacklight assembly of claim 1, wherein at least one of the first andsecond sidewalls of the receiving container includes the optical sheetfixing portion which fixes the optical sheet relative to the receivingcontainer.
 15. The backlight assembly of claim 1, wherein the firstlight guide plate fixing portion is spaced apart from the recessedstepped portion by a first gap, and wherein a side face of the lightguide plate is spaced apart from the first sidewall of the receivingcontainer by a second gap, wherein the second gap is smaller than thefirst gap when the first sidewall has a larger surface area than thefirst light guide plate fixing portion, and wherein the second gap islarger than the first gap when the first sidewall has a smaller surfacearea than the first light guide plate fixing portion.
 16. The backlightassembly of claim 1, wherein the recessed stepped portion has a roundedge.
 17. The backlight assembly of claim 16, wherein the round edge ofthe recessed stepped portion has a radius of curvature not less thanabout 0.3 mm.
 18. The backlight assembly of claim 1, wherein thereceiving container further comprises a fixing boss disposed at thefirst light guide plate fixing portion.
 19. The backlight assembly ofclaim 1, wherein a distance between the first light guide plate fixingportion and the second sidewall is smaller than a distance between thefirst sidewall and the second sidewall.
 20. The backlight assembly ofclaim 19, wherein the receiving container further comprises a fixingboss disposed at the first light guide plate fixing portion.
 21. Thebacklight assembly of claim 1, wherein the first light guide platefixing portion extends in a direction substantially parallel to thefirst sidewall.
 22. The backlight assembly of claim 1, wherein the firstlight guide plate fixing portion extends in a direction substantiallyparallel to the first sidewall.
 23. The backlight assembly of claim 1,wherein the first sidewall extends upwardly from a first side edge ofthe bottom plate, and the second side wall extends upwardly from asecond side edge of the bottom plate, which is opposite to the firstside edge, and the receiving container further comprises a thirdsidewall extends upwardly from a third side edge of the bottom plate,which connects to the first and second side edges to each other, and afourth sidewall extends upwardly from a fourth side edge of the bottomplate, which is opposite to the third side edge.
 24. The backlightassembly of claim 1, wherein the receiving container further comprises afixing boss disposed at the first sidewall.
 25. The backlight assemblyof claim 1, wherein the first light guide plate fixing portion extendsin a direction substantially parallel to the horizontal extendingdirection of the first sidewall.
 26. The backlight assembly of claim 1,wherein receiving container further comprises a second light guide platefixing portion extends from the first sidewall in substantially the samedirection of the first light guide plate fixing portion.
 27. Thebacklight assembly of claim 1, wherein the receiving container furthercomprises a fixing boss disposed at the first sidewall.
 28. Thebacklight assembly of claim 1, wherein the first light guide platefixing portion extends in a direction substantially parallel to thehorizontal extending direction of the first sidewall.
 29. The backlightassembly of claim 1, wherein receiving container further comprises asecond light guide plate fixing portion extends from the first sidewallin substantially the same direction of the first light guide platefixing portion.
 30. A display device comprising: a backlight assembly,the backlight assembly including: a light guide plate having a recessedstepped portion formed at a side of the light guide plate; an opticalsheet disposed over the light guide plate; and a receiving containerreceiving the light guide plate and the optical sheet, the receivingcontainer including a bottom plate, a first sidewall and a secondsidewall facing the first sidewall, wherein the first and secondsidewalls extend upwardly from edge portions of the bottom plate, thereceiving container further including a first light guide plate fixingportion having a horizontal thickness substantially same as one of ahorizontal thickness of the first and second sidewalls such that thehorizontal thickness is a thickness in a recessed direction of therecessed stepped portion, wherein a portion of the first light guideplate fixing portion is aligned with the recessed stepped portion of thelight guide plate, wherein the first light guide plate fixing portionextends upwardly from edge portions of the bottom plate, and wherein thefirst light guide plate fixing portion is spaced apart from the firstand second sidewalls; a panel guiding member combined with the receivingcontainer; and a display panel disposed on the panel guiding member, thedisplay panel converting light generated from the backlight assemblyinto an image.
 31. The display device of claim 30, wherein the opticalsheet comprises a fixing hole aligned with an optical sheet fixingportion, wherein the fixing hole is provided within a fixing protrusionprotruding from the optical sheet.
 32. The display device of claim 30,wherein the light guide plate fixing portion, the bottom plate and thefirst and second sidewalls are integrally formed.
 33. The display deviceof claim 30, wherein at least one of the first and second sidewalls ofthe receiving container includes an optical sheet fixing portion whichfixes the optical sheet relative to the receiving container.
 34. Thedisplay device of claim 30, wherein the receiving container furthercomprises a fixing boss disposed at the first light guide plate fixingportion.
 35. The display device of claim 30, wherein a distance betweenthe first light guide plate fixing portion and the second sidewall issmaller than a distance between the first sidewall and the secondsidewall.
 36. The display device of claim 35, wherein the receivingcontainer further comprises a fixing boss disposed at the first lightguide plate fixing portion.
 37. The display device of claim 30, whereinthe first light guide plate fixing portion extends in a directionsubstantially parallel to the first sidewall.
 38. The display device ofclaim 30, wherein the first light guide plate fixing portion extends ina direction substantially parallel to the first sidewall.
 39. Thedisplay device of claim 30, wherein the first sidewall extends upwardlyfrom a first side edge of the bottom plate, and the second side wallextends upwardly from a second side edge of the bottom plate, which isopposite to the first side edge, and the receiving container furthercomprises a third sidewall extends upwardly from a third side edge ofthe bottom plate, which connects to the first and second side edges toeach other, and a fourth sidewall extends upwardly from a fourth sideedge of the bottom plate, which is opposite to the third side edge. 40.A method for assembling a display device in a top down assemblingprocess, the method comprising: providing a receiving containerincluding a bottom plate, a first sidewall and a second sidewall facingthe first sidewall, wherein the first and second sidewalls extendupwardly from edge portions of the bottom plate, the receiving containerfurther including a first light guide plate fixing portion having ahorizontal thickness substantially same as one of a horizontal thicknessof the first and second sidewalls such that the horizontal thickness isa thickness in a recessed direction of the recessed stepped portion,wherein a portion of the first light guide plate fixing portion isaligned with the recessed stepped portion of the light guide plate,wherein the first light guide plate fixing portion extends upwardly fromedge portions of the bottom plate, and wherein the first light guideplate fixing portion is spaced apart from the first and secondsidewalls; providing a light guide plate with a recessed stepped portionat a side of the light guide plate; placing the light guide plate intothe receiving container; and aligning the light guide plate fixingportion with the recessed stepped portion.
 41. The method of claim 40,further comprising: providing a panel guiding member over the lightguide plate and the receiving container; providing a combination hole ona side plate of the panel guiding member; providing a combination hookon at least one of the first and second sidewalls of the receivingcontainer; and securing the combination hook within the combination holeas the panel guiding member is placed over the receiving container. 42.The method of claim 40, further comprising: providing a panel guidingmember over the light guide plate and the receiving container; providinga pressing protrusion depending from the panel guiding member; andabutting the pressing protrusion with the recessed stepped portion ofthe light guide plate.
 43. The method of claim 40, wherein the lightguide plate fixing portion, the bottom plate and the first and secondsidewalls are integrally formed.
 44. The method of claim 40, furthercomprising: providing the optical sheet with a fixing hole; providing atleast one of the first, second, third and fourth sidewalls of thereceiving container with a fixing boss; placing the optical sheet overthe light guide plate; and inserting the fixing boss within the fixinghole.
 45. A backlight assembly comprising: a light guide plate having arecessed stepped portion disposed at a corner of the light guide plate;an optical sheet disposed over the light guide plate; and a receivingcontainer which receives the light guide plate and the optical sheet,the receiving container including a bottom plate, a first sidewall, asecond sidewall facing the first sidewall, a third sidewall, and afourth sidewall facing the third sidewall wherein the first to fourthsidewalls extend upwardly from edge portions of the bottom plate, thereceiving container further including a first light guide plate fixingportion having a horizontal thickness substantially same as one of ahorizontal thickness of the first and second sidewalls such that thehorizontal thickness is a thickness in a recessed direction of therecessed stepped portion, wherein at least a portion of the first lightguide plate fixing portion is aligned with the recessed stepped portionof the light guide plate, wherein the first light guide plate fixingportion extends from the first sidewall in a first direction crossing ahorizontal extending direction of the first sidewall, and wherein thefirst light guide plate fixing portion is disposed between the steppedportion of the light guide plate and a light source assembly, and isspaced apart from the third and fourth sidewalls.
 46. A display devicecomprising: a backlight assembly, the backlight assembly including: alight guide plate having a recessed stepped portion formed at a cornerof the light guide plate; an optical sheet disposed over the light guideplate; a receiving container which receives the light guide plate andthe optical sheet, the receiving container including a bottom plate, afirst sidewall, a second sidewall facing the first sidewall, a thirdsidewall, and a fourth sidewall facing the third sidewall, wherein thefirst to fourth sidewalls extend upwardly from edge portions of thebottom plate, the receiving container further including a first lightguide plate fixing portion having a horizontal thickness substantiallysame as one of a horizontal thickness of the first and second sidewallssuch that the horizontal thickness is a thickness in a recesseddirection of the recessed stepped portion, wherein at least a portion ofthe first light guide plate fixing portion is aligned with the recessedstepped portion of the light guide plate, wherein the first light guideplate fixing portion extends from the first sidewall in a firstdirection crossing a horizontal extending direction of the firstsidewall, and wherein the first light guide plate fixing portion isdisposed between the stepped portion of the light guide plate and alight source assembly, and is spaced apart from the third and fourthsidewalls; a panel guiding member combined with the receiving container;and a display panel disposed on the panel guiding member, the displaypanel converting light generated from the backlight assembly into animage.
 47. A method for assembling a display device in a top downassembling process, the method comprising: providing a receivingcontainer which receives the light guide plate and the optical sheet,the receiving container including a bottom plate, a first sidewall, asecond sidewall facing the first sidewall, a third sidewall, and afourth sidewall facing the third sidewall, wherein the first to fourthsidewalls extend upwardly from edge portions of the bottom plate, thereceiving container further including a first light guide plate fixingportion having a horizontal thickness substantially same as one of ahorizontal thickness of the first and second sidewalls such that thehorizontal thickness is a thickness in a recessed direction of therecessed stepped portion, wherein at least a portion of the first lightguide plate fixing portion is aligned with the recessed stepped portionof the light guide plate, wherein the first light guide plate fixingportion extends from the first sidewall in a first direction crossing ahorizontal extending direction of the first sidewall, and wherein thefirst light guide plate fixing portion is disposed between the steppedportion of the light guide plate and a light source assembly, and isspaced apart from the third and fourth sidewalls, providing a lightguide plate with a recessed stepped portion at a corner of the lightguide plate; placing the light guide plate into the receiving container;and aligning the light guide plate fixing portion with the recessedstepped portion.
 48. A backlight assembly comprising: a light guideplate having a recessed stepped portion disposed at a corner of thelight guide plate; an optical sheet disposed over the light guide plate;and a receiving container which receives the light guide plate and theoptical sheet, the receiving container including a bottom plate, a firstsidewall, a second sidewall facing the first sidewall, and a light guideplate fixing portion having a horizontal thickness substantially same asone of a horizontal thickness of the first and second sidewalls, whereinthe first sidewall extends upwardly from a first side edge of the bottomplate, and the second sidewall extends upwardly from a second side edgeof the bottom plate opposite to the first side edge, and the light guideplate fixing portion extends upwardly from a third side edge of thebottom plate, which connects the first and second side edges to eachother, wherein at least a portion of the light guide plate fixingportion is aligned with the recessed stepped portion of the light guideplate, and wherein the light guide plate fixing portion is spaced apartfrom the first and second sidewalls.
 49. The backlight assembly of claim48, wherein the receiving container further comprises a fixing bossdisposed at the light guide plate fixing portion.
 50. The backlightassembly of claim 48, wherein a first portion of the light guide platefixing portion extends from a first end of the light guide plate fixingportion in a direction substantially perpendicular to the third sideedge.
 51. The backlight assembly of claim 50, wherein a second portionof the light guide plate fixing portion extends from a second end of thelight guide plate fixing portion, which is opposite to the first end, ina direction substantially perpendicular to the third side edge.
 52. Adisplay device comprising: a backlight assembly, the backlight assemblyincluding: a light guide plate having a recessed stepped portion formedat a corner of the light guide plate; an optical sheet disposed over thelight guide plate; a receiving container which receives the light guideplate and the optical sheet, the receiving container including a bottomplate, a first sidewall, a second sidewall facing the first sidewall,and a light guide plate fixing portion having a horizontal thicknesssubstantially same as one of a horizontal thickness of the first andsecond sidewalls, wherein the first sidewall extends upwardly from afirst side edge of the bottom plate, and the second sidewall extendsupwardly from a second side edge of the bottom plate opposite to thefirst side edge, and the light guide plate fixing portion extendsupwardly from a third side edge of the bottom plate, which connects thefirst and second side edges to each other, wherein at least a portion ofthe light guide plate fixing portion is aligned with the recessedstepped portion of the light guide plate, wherein the light guide platefixing portion is spaced apart from the first and second sidewalls,wherein the first light guide plate fixing portion extends from thefirst sidewall in a first direction crossing a horizontal extendingdirection of the first sidewall, and wherein the first light guide platefixing portion is disposed between the stepped portion of the lightguide plate and a light source assembly, and is spaced apart from thethird and fourth sidewalls; a panel guiding member combined with thereceiving container; and a display panel disposed on the panel guidingmember, the display panel converting light generated from the backlightassembly into an image.
 53. The display device of claim 52, wherein thereceiving container further comprises a fixing boss disposed at thelight guide plate fixing portion.
 54. The display device of claim 52,wherein a first portion of the light guide plate fixing portion extendsfrom a first end of the light guide plate fixing portion in a directionsubstantially perpendicular to the third side edge.
 55. The displaydevice of claim 54, wherein a second portion of the light guide platefixing portion extends from a second end of the light guide plate fixingportion, which is opposite to the first end, in a directionsubstantially perpendicular to the third side edge.